Exam 38: Plant Developmental Responses to External and Internal Signals

You would like to develop an herbicide that is structurally most similar to cytokinin. Which of the following molecules would you use as starting material?

You shine light having a wavelength of 660 nm on a plant. Which of the following will most likely happen next?

____ is growth in response to a mechanical stimulus, such as contact with a solid object.

When a root is placed on its side, what happens to the amyloplasts in the root cap cells?

The purification and elucidation of the primary auxin's chemical structure were accomplished by:

The herbicides (weed killers) 2,4-D and 2,4,5-T are examples of synthetic:

The movement of auxin downward from its site of production is referred to as:

When Pfr absorbs far-red light, the Pfr is converted to Pr.

Which of the following would be characteristic of a plant exhibiting shade avoidance?

When a plant responds to external stimuli, such as light, gravity, or touch by directional growth, these responses are referred to as:

Which of the following sequences correctly represents the phytochrome signal transduction pathway?

A long day plant will flower when exposed to short nights.

Summarize the experiment by Darwin that provided the first evidence for auxins.

Describe the evidence for the existence of a flowering promoter and also for the existence of a flowering inhibitor.

The application of ____ substitutes for low temperature or light requirements for biennial germination.

The photoreceptor for photoperiodism and some other light-initiated plant responses is a group of blue-green pigments named:

Ethylene stimulates the ripening of fruits.

The most common and physiologically important auxin is:

____ is a lipid-derived hormone produced in response to the presence of insect pests.